Vantaggi
I cannot think of a single one. If you like working at a woke, relentlessly far-left company (MMC) that capitalizes "Black" and lowercases "white" (in case you missed the point, there is literally a black-only "Race Council" and a scholarship and internship program ONLY for black students (illegal?)...and the company BRAGS about discriminating against other kids!) then maybe this is the place for you. I've been at this firm a LONG time and the violent leftward shift in the culture has been jarring. Used to be your views were your own business. Now you have to worship at the woke altar.
Svantaggi
Marsh McLennan is undergoing a massive, hugely disorganized reorganization. Mercer is now effectively an empty shell: it is a brand, nothing more, with Marsh, an insurance broker, running the show. You see, MMC posted record profits, so the genius-level "leadership" decided it was time for a change that involved stealth layoffs decimating Mercer. An HR consultant that can't lay off its people fast enough. At least my MMC stock is going up as a result.